feat(charting): unify configurable time windows

backend/tests/test_scheduler.py

@@ -87,6 +87,32 @@ def test_scheduler_routes_expose_status_history_and_disabled_manual_run(schedule
     assert manual.status_code == 400
 
 
+def test_scheduler_samples_all_values_reads_all_retained_samples(scheduler_client):
+    client, store = scheduler_client
+    service = store.upsert_service(
+        {
+            "service_type": "qbittorrent",
+            "name": "qbit",
+            "config": {"base_url": "http://qbit:8080"},
+            "secrets": {},
+            "enabled": True,
+        }
+    )
+    retained = [{"ts": 10, "dl_speed": 20, "up_speed": 30}]
+    with patch("media_library_viewer_api.routers.scheduler.QbittorrentSampleStore") as store_cls:
+        store_cls.return_value.window.return_value = retained
+        response = client.get(f"/api/scheduler/services/{service['id']}/samples?all_values=true")
+
+    assert response.status_code == 200
+    assert response.json() == {
+        "service_id": service["id"],
+        "window_seconds": None,
+        "all_values": True,
+        "samples": retained,
+    }
+    store_cls.return_value.window.assert_called_once_with(service["id"])
+
+
 def test_sample_store_applies_time_and_row_limits(tmp_path):
     harness = ServiceDataHarness(tmp_path)
     harness.register(QBITTORRENT_CONCERN)